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The European Physical Journal Special Topics

, Volume 166, Issue 1, pp 21–27 | Cite as

An experimental test of the scaling prediction for the spatial distribution of water during the drying of colloidal films

  • P. Ekanayake
  • P. J. McDonald
  • J. L. KeddieEmail author
Regular Article

Abstract

A Peclet number, Pe, for the drying of colloidal films can be used as a predictor of the uniformity of water concentration in the direction normal to the film. Uniform drying is predicted to occur when Pe < 1, whereas with \(\textit{Pe}>1\), a layer of packed particles is expected to develop above a more dilute layer. Routh and Zimmerman have more recently proposed that the particle concentration gradient between the packed and dilute layers, \(d \phi _{p} / d \textit{z} \), will scale as \(\textit{Pe}^{1/2}\). Here, this scaling relation is tested experimentally with magnetic resonance profiling data obtained from waterborne colloidal films dried under conditions to yield a range of Pe. It is found that \(d\phi_{p}/d\textit{z}\) increases with Pe but scales as \(\textit{Pe}^{0.8}\). This disagreement with the prediction can be attributed to an underestimate of Pe when there are greater non-uniformities of drying, because of an unquantified slowing down of the evaporation rate.

Keywords

Evaporation Rate European Physical Journal Special Topic Peclet Number Butyl Acrylate Dynamical Wetting 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2009

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of PeradeniyaPeradeniyaSri Lanka
  2. 2.Department of PhysicsUniversity of SurreyGuildfordUK

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